Soft rubber pepper balls are not widely used in the industrial field. When smart phones flourished, some mobile phones would use TPU pepper balls, which are soft rubber pepper balls. However, the hardness of soft rubber pepper balls used in mobile phones is about 95 degrees, and the surface should be made into a matte surface, which is relatively difficult in technology. At that time, only two companies in China were able to produce TPU soft rubber pepper balls.The diameter of TPU soft boric acid ball is 5.45mm, and the blank ball should be more than 6MM, so the processing capacity is very large, and the productivity is not high. One machine can produce tens of thousands of balls in one day, so the price is very high. At the highest, 2 yuan spends a penny, and the plastic ball of mobile phone is also called the mobile phone trackball. Now basically no one uses the trackball mobile phone, and the plastic soft pepper ball of mobile phone has completely withdrawn from the mobile phone manufacturing industry.